Advice needed, problem with short wires in box

In my never ending remodeling projects, I am in the process of adding a couple of recepticles to my existing kitchen circuit. It is a 20A circuit and only has 2 single receptacles on it now and I am changing them to duplexes.

The problem is that the wires in the boxes were trimmed very short, they extend maybe an inch or so beyond the boxes, don't ask me why, it is just how they are. Can I add a pigtail to these to give myself sufficient working length extending beyond the box or is it necessary to pull new wire to remedy this situation (would be a real pain). I guess my basic question here is "do all wire ends need to extend the minimum distance from the box or just the ones connecting the device at that box"?

Having recently wired my vacation home in the same county, the inspector pulled a "sample" recepticle to check my work, including the length of the wires, so I imagine he will do the same here.

300.14 Length of Free Conductors at Outlets, Junctions, and Switch Points.
At least 150 mm (6 in.) of free conductor, measured from the point in the box where it emerges from its raceway or cable sheath, shall be left at each outlet, junction, and switch point for splices or the connection of luminaires or devices. Where the opening to an outlet, junction, or switch point is less than 200 mm (8 in.) in any dimension, each conductor shall be long enough to extend at least 75 mm (3 in.) outside the opening.

If they are 1" out of the box you have enough (barely) to work with and pigtail them.

You might try to loosen the box clamps (if any) and see if there is any slack in the wall. You can also (sometimes) relocate the box up or down to get more wire. No inspector is going to turn down a repair like that. New installation and repair generally have different criteria.